.button-ui {
    display: inline-block;
    box-sizing: border-box;
    padding: 0;
    border: none;
    background: none;
    span {
        display: block;
    }
}
.button-ui-main {
    background-color: $color-main;
    span {
        color: #fff;
    }
}

.button-ui-round {
    border-radius: $button-round;
}
.button-ui-block { display: block; width: 100%; }
.button-ui-large {
    span {
        font-size: 16px;
        padding: 18px 0;
    }
}

.button-ui-default {
    
}